<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<input type="checkbox" id="ck" />
		<hr />
		<div id="div">
			<input type="checkbox"/><br />
			<input type="checkbox" /><br />
			<input type="checkbox" /><br />
			<input type="checkbox" /><br />
			<input type="checkbox" />
		</div>
	</body>
    <script>
        document.getElementById('ck').onclick = function () {
            let oDiv = document.getElementById('div');
            let arrInputs = oDiv.children;
            for (let i = 0; i < arrInputs.length; i++) {
                let oInput = arrInputs[i];
                oInput.checked=this.checked;
            }
        }
    </script>
</html>